blob: d6543fc4a923edbf3d7518737e2f64915e6c941a [file] [log] [blame]
Doug Warzecha90563ec2005-09-06 15:17:15 -07001/*
2 * dcdbas.c: Dell Systems Management Base Driver
3 *
4 * The Dell Systems Management Base Driver provides a sysfs interface for
5 * systems management software to perform System Management Interrupts (SMIs)
6 * and Host Control Actions (power cycle or power off after OS shutdown) on
7 * Dell systems.
8 *
9 * See Documentation/dcdbas.txt for more information.
10 *
11 * Copyright (C) 1995-2005 Dell Inc.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License v2.0 as published by
15 * the Free Software Foundation.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 */
22
Russell Kingd052d1b2005-10-29 19:07:23 +010023#include <linux/platform_device.h>
Doug Warzecha90563ec2005-09-06 15:17:15 -070024#include <linux/dma-mapping.h>
25#include <linux/errno.h>
26#include <linux/init.h>
27#include <linux/kernel.h>
28#include <linux/mc146818rtc.h>
29#include <linux/module.h>
30#include <linux/reboot.h>
31#include <linux/sched.h>
32#include <linux/smp.h>
33#include <linux/spinlock.h>
34#include <linux/string.h>
35#include <linux/types.h>
Arjan van de Ven8ed965d2006-03-23 03:00:21 -080036#include <linux/mutex.h>
Doug Warzecha90563ec2005-09-06 15:17:15 -070037#include <asm/io.h>
38#include <asm/semaphore.h>
39
40#include "dcdbas.h"
41
42#define DRIVER_NAME "dcdbas"
Doug Warzecha435a80f2006-03-09 17:33:35 -080043#define DRIVER_VERSION "5.6.0-2"
Doug Warzecha90563ec2005-09-06 15:17:15 -070044#define DRIVER_DESCRIPTION "Dell Systems Management Base Driver"
45
46static struct platform_device *dcdbas_pdev;
47
48static u8 *smi_data_buf;
49static dma_addr_t smi_data_buf_handle;
50static unsigned long smi_data_buf_size;
51static u32 smi_data_buf_phys_addr;
Arjan van de Ven8ed965d2006-03-23 03:00:21 -080052static DEFINE_MUTEX(smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -070053
54static unsigned int host_control_action;
55static unsigned int host_control_smi_type;
56static unsigned int host_control_on_shutdown;
57
58/**
59 * smi_data_buf_free: free SMI data buffer
60 */
61static void smi_data_buf_free(void)
62{
63 if (!smi_data_buf)
64 return;
65
66 dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
67 __FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size);
68
69 dma_free_coherent(&dcdbas_pdev->dev, smi_data_buf_size, smi_data_buf,
70 smi_data_buf_handle);
71 smi_data_buf = NULL;
72 smi_data_buf_handle = 0;
73 smi_data_buf_phys_addr = 0;
74 smi_data_buf_size = 0;
75}
76
77/**
78 * smi_data_buf_realloc: grow SMI data buffer if needed
79 */
80static int smi_data_buf_realloc(unsigned long size)
81{
82 void *buf;
83 dma_addr_t handle;
84
85 if (smi_data_buf_size >= size)
86 return 0;
87
88 if (size > MAX_SMI_DATA_BUF_SIZE)
89 return -EINVAL;
90
91 /* new buffer is needed */
92 buf = dma_alloc_coherent(&dcdbas_pdev->dev, size, &handle, GFP_KERNEL);
93 if (!buf) {
94 dev_dbg(&dcdbas_pdev->dev,
95 "%s: failed to allocate memory size %lu\n",
96 __FUNCTION__, size);
97 return -ENOMEM;
98 }
99 /* memory zeroed by dma_alloc_coherent */
100
101 if (smi_data_buf)
102 memcpy(buf, smi_data_buf, smi_data_buf_size);
103
104 /* free any existing buffer */
105 smi_data_buf_free();
106
107 /* set up new buffer for use */
108 smi_data_buf = buf;
109 smi_data_buf_handle = handle;
110 smi_data_buf_phys_addr = (u32) virt_to_phys(buf);
111 smi_data_buf_size = size;
112
113 dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
114 __FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size);
115
116 return 0;
117}
118
119static ssize_t smi_data_buf_phys_addr_show(struct device *dev,
120 struct device_attribute *attr,
121 char *buf)
122{
123 return sprintf(buf, "%x\n", smi_data_buf_phys_addr);
124}
125
126static ssize_t smi_data_buf_size_show(struct device *dev,
127 struct device_attribute *attr,
128 char *buf)
129{
130 return sprintf(buf, "%lu\n", smi_data_buf_size);
131}
132
133static ssize_t smi_data_buf_size_store(struct device *dev,
134 struct device_attribute *attr,
135 const char *buf, size_t count)
136{
137 unsigned long buf_size;
138 ssize_t ret;
139
140 buf_size = simple_strtoul(buf, NULL, 10);
141
142 /* make sure SMI data buffer is at least buf_size */
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800143 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700144 ret = smi_data_buf_realloc(buf_size);
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800145 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700146 if (ret)
147 return ret;
148
149 return count;
150}
151
152static ssize_t smi_data_read(struct kobject *kobj, char *buf, loff_t pos,
153 size_t count)
154{
155 size_t max_read;
156 ssize_t ret;
157
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800158 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700159
160 if (pos >= smi_data_buf_size) {
161 ret = 0;
162 goto out;
163 }
164
165 max_read = smi_data_buf_size - pos;
166 ret = min(max_read, count);
167 memcpy(buf, smi_data_buf + pos, ret);
168out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800169 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700170 return ret;
171}
172
173static ssize_t smi_data_write(struct kobject *kobj, char *buf, loff_t pos,
174 size_t count)
175{
176 ssize_t ret;
177
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800178 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700179
180 ret = smi_data_buf_realloc(pos + count);
181 if (ret)
182 goto out;
183
184 memcpy(smi_data_buf + pos, buf, count);
185 ret = count;
186out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800187 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700188 return ret;
189}
190
191static ssize_t host_control_action_show(struct device *dev,
192 struct device_attribute *attr,
193 char *buf)
194{
195 return sprintf(buf, "%u\n", host_control_action);
196}
197
198static ssize_t host_control_action_store(struct device *dev,
199 struct device_attribute *attr,
200 const char *buf, size_t count)
201{
202 ssize_t ret;
203
204 /* make sure buffer is available for host control command */
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800205 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700206 ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800207 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700208 if (ret)
209 return ret;
210
211 host_control_action = simple_strtoul(buf, NULL, 10);
212 return count;
213}
214
215static ssize_t host_control_smi_type_show(struct device *dev,
216 struct device_attribute *attr,
217 char *buf)
218{
219 return sprintf(buf, "%u\n", host_control_smi_type);
220}
221
222static ssize_t host_control_smi_type_store(struct device *dev,
223 struct device_attribute *attr,
224 const char *buf, size_t count)
225{
226 host_control_smi_type = simple_strtoul(buf, NULL, 10);
227 return count;
228}
229
230static ssize_t host_control_on_shutdown_show(struct device *dev,
231 struct device_attribute *attr,
232 char *buf)
233{
234 return sprintf(buf, "%u\n", host_control_on_shutdown);
235}
236
237static ssize_t host_control_on_shutdown_store(struct device *dev,
238 struct device_attribute *attr,
239 const char *buf, size_t count)
240{
241 host_control_on_shutdown = simple_strtoul(buf, NULL, 10);
242 return count;
243}
244
245/**
246 * smi_request: generate SMI request
247 *
248 * Called with smi_data_lock.
249 */
250static int smi_request(struct smi_cmd *smi_cmd)
251{
252 cpumask_t old_mask;
253 int ret = 0;
254
255 if (smi_cmd->magic != SMI_CMD_MAGIC) {
256 dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
257 __FUNCTION__);
258 return -EBADR;
259 }
260
261 /* SMI requires CPU 0 */
262 old_mask = current->cpus_allowed;
263 set_cpus_allowed(current, cpumask_of_cpu(0));
264 if (smp_processor_id() != 0) {
265 dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
266 __FUNCTION__);
267 ret = -EBUSY;
268 goto out;
269 }
270
271 /* generate SMI */
272 asm volatile (
273 "outb %b0,%w1"
274 : /* no output args */
275 : "a" (smi_cmd->command_code),
276 "d" (smi_cmd->command_address),
277 "b" (smi_cmd->ebx),
278 "c" (smi_cmd->ecx)
279 : "memory"
280 );
281
282out:
283 set_cpus_allowed(current, old_mask);
284 return ret;
285}
286
287/**
288 * smi_request_store:
289 *
290 * The valid values are:
291 * 0: zero SMI data buffer
292 * 1: generate calling interface SMI
293 * 2: generate raw SMI
294 *
295 * User application writes smi_cmd to smi_data before telling driver
296 * to generate SMI.
297 */
298static ssize_t smi_request_store(struct device *dev,
299 struct device_attribute *attr,
300 const char *buf, size_t count)
301{
302 struct smi_cmd *smi_cmd;
303 unsigned long val = simple_strtoul(buf, NULL, 10);
304 ssize_t ret;
305
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800306 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700307
308 if (smi_data_buf_size < sizeof(struct smi_cmd)) {
309 ret = -ENODEV;
310 goto out;
311 }
312 smi_cmd = (struct smi_cmd *)smi_data_buf;
313
314 switch (val) {
315 case 2:
316 /* Raw SMI */
317 ret = smi_request(smi_cmd);
318 if (!ret)
319 ret = count;
320 break;
321 case 1:
322 /* Calling Interface SMI */
323 smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer);
324 ret = smi_request(smi_cmd);
325 if (!ret)
326 ret = count;
327 break;
328 case 0:
329 memset(smi_data_buf, 0, smi_data_buf_size);
330 ret = count;
331 break;
332 default:
333 ret = -EINVAL;
334 break;
335 }
336
337out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800338 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700339 return ret;
340}
341
342/**
343 * host_control_smi: generate host control SMI
344 *
345 * Caller must set up the host control command in smi_data_buf.
346 */
347static int host_control_smi(void)
348{
349 struct apm_cmd *apm_cmd;
350 u8 *data;
351 unsigned long flags;
352 u32 num_ticks;
353 s8 cmd_status;
354 u8 index;
355
356 apm_cmd = (struct apm_cmd *)smi_data_buf;
357 apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
358
359 switch (host_control_smi_type) {
360 case HC_SMITYPE_TYPE1:
361 spin_lock_irqsave(&rtc_lock, flags);
362 /* write SMI data buffer physical address */
363 data = (u8 *)&smi_data_buf_phys_addr;
364 for (index = PE1300_CMOS_CMD_STRUCT_PTR;
365 index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
366 index++, data++) {
367 outb(index,
368 (CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
369 outb(*data,
370 (CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
371 }
372
373 /* first set status to -1 as called by spec */
374 cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
375 outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
376
377 /* generate SMM call */
378 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
379 spin_unlock_irqrestore(&rtc_lock, flags);
380
381 /* wait a few to see if it executed */
382 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
383 while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
384 == ESM_STATUS_CMD_UNSUCCESSFUL) {
385 num_ticks--;
386 if (num_ticks == EXPIRED_TIMER)
387 return -ETIME;
388 }
389 break;
390
391 case HC_SMITYPE_TYPE2:
392 case HC_SMITYPE_TYPE3:
393 spin_lock_irqsave(&rtc_lock, flags);
394 /* write SMI data buffer physical address */
395 data = (u8 *)&smi_data_buf_phys_addr;
396 for (index = PE1400_CMOS_CMD_STRUCT_PTR;
397 index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
398 index++, data++) {
399 outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
400 outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
401 }
402
403 /* generate SMM call */
404 if (host_control_smi_type == HC_SMITYPE_TYPE3)
405 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
406 else
407 outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
408
409 /* restore RTC index pointer since it was written to above */
410 CMOS_READ(RTC_REG_C);
411 spin_unlock_irqrestore(&rtc_lock, flags);
412
413 /* read control port back to serialize write */
414 cmd_status = inb(PE1400_APM_CONTROL_PORT);
415
416 /* wait a few to see if it executed */
417 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
418 while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
419 num_ticks--;
420 if (num_ticks == EXPIRED_TIMER)
421 return -ETIME;
422 }
423 break;
424
425 default:
426 dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
427 __FUNCTION__, host_control_smi_type);
428 return -ENOSYS;
429 }
430
431 return 0;
432}
433
434/**
435 * dcdbas_host_control: initiate host control
436 *
437 * This function is called by the driver after the system has
438 * finished shutting down if the user application specified a
439 * host control action to perform on shutdown. It is safe to
440 * use smi_data_buf at this point because the system has finished
441 * shutting down and no userspace apps are running.
442 */
443static void dcdbas_host_control(void)
444{
445 struct apm_cmd *apm_cmd;
446 u8 action;
447
448 if (host_control_action == HC_ACTION_NONE)
449 return;
450
451 action = host_control_action;
452 host_control_action = HC_ACTION_NONE;
453
454 if (!smi_data_buf) {
455 dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __FUNCTION__);
456 return;
457 }
458
459 if (smi_data_buf_size < sizeof(struct apm_cmd)) {
460 dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
461 __FUNCTION__);
462 return;
463 }
464
465 apm_cmd = (struct apm_cmd *)smi_data_buf;
466
467 /* power off takes precedence */
468 if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
469 apm_cmd->command = ESM_APM_POWER_CYCLE;
470 apm_cmd->reserved = 0;
471 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
472 host_control_smi();
473 } else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
474 apm_cmd->command = ESM_APM_POWER_CYCLE;
475 apm_cmd->reserved = 0;
476 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
477 host_control_smi();
478 }
479}
480
481/**
482 * dcdbas_reboot_notify: handle reboot notification for host control
483 */
484static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
485 void *unused)
486{
487 static unsigned int notify_cnt = 0;
488
489 switch (code) {
490 case SYS_DOWN:
491 case SYS_HALT:
492 case SYS_POWER_OFF:
493 if (host_control_on_shutdown) {
494 /* firmware is going to perform host control action */
495 if (++notify_cnt == 2) {
496 printk(KERN_WARNING
497 "Please wait for shutdown "
498 "action to complete...\n");
499 dcdbas_host_control();
500 }
501 /*
502 * register again and initiate the host control
503 * action on the second notification to allow
504 * everyone that registered to be notified
505 */
506 register_reboot_notifier(nb);
507 }
508 break;
509 }
510
511 return NOTIFY_DONE;
512}
513
514static struct notifier_block dcdbas_reboot_nb = {
515 .notifier_call = dcdbas_reboot_notify,
516 .next = NULL,
517 .priority = 0
518};
519
520static DCDBAS_BIN_ATTR_RW(smi_data);
521
522static struct bin_attribute *dcdbas_bin_attrs[] = {
523 &bin_attr_smi_data,
524 NULL
525};
526
527static DCDBAS_DEV_ATTR_RW(smi_data_buf_size);
528static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr);
529static DCDBAS_DEV_ATTR_WO(smi_request);
530static DCDBAS_DEV_ATTR_RW(host_control_action);
531static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
532static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);
533
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800534static struct attribute *dcdbas_dev_attrs[] = {
535 &dev_attr_smi_data_buf_size.attr,
536 &dev_attr_smi_data_buf_phys_addr.attr,
537 &dev_attr_smi_request.attr,
538 &dev_attr_host_control_action.attr,
539 &dev_attr_host_control_smi_type.attr,
540 &dev_attr_host_control_on_shutdown.attr,
Doug Warzecha90563ec2005-09-06 15:17:15 -0700541 NULL
542};
543
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800544static struct attribute_group dcdbas_attr_group = {
545 .attrs = dcdbas_dev_attrs,
546};
547
548static int __devinit dcdbas_probe(struct platform_device *dev)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700549{
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800550 int i, error;
Doug Warzecha90563ec2005-09-06 15:17:15 -0700551
552 host_control_action = HC_ACTION_NONE;
553 host_control_smi_type = HC_SMITYPE_NONE;
554
Doug Warzecha90563ec2005-09-06 15:17:15 -0700555 /*
556 * BIOS SMI calls require buffer addresses be in 32-bit address space.
557 * This is done by setting the DMA mask below.
558 */
559 dcdbas_pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
560 dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask;
561
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800562 error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
563 if (error)
564 return error;
565
566 for (i = 0; dcdbas_bin_attrs[i]; i++) {
567 error = sysfs_create_bin_file(&dev->dev.kobj,
568 dcdbas_bin_attrs[i]);
569 if (error) {
570 while (--i >= 0)
571 sysfs_remove_bin_file(&dev->dev.kobj,
572 dcdbas_bin_attrs[i]);
573 sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
574 return error;
575 }
576 }
577
Doug Warzecha90563ec2005-09-06 15:17:15 -0700578 register_reboot_notifier(&dcdbas_reboot_nb);
579
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800580 dev_info(&dev->dev, "%s (version %s)\n",
Doug Warzecha90563ec2005-09-06 15:17:15 -0700581 DRIVER_DESCRIPTION, DRIVER_VERSION);
582
583 return 0;
584}
585
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800586static int __devexit dcdbas_remove(struct platform_device *dev)
587{
588 int i;
589
590 unregister_reboot_notifier(&dcdbas_reboot_nb);
591 for (i = 0; dcdbas_bin_attrs[i]; i++)
592 sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]);
593 sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
594
595 return 0;
596}
597
598static struct platform_driver dcdbas_driver = {
599 .driver = {
600 .name = DRIVER_NAME,
601 .owner = THIS_MODULE,
602 },
603 .probe = dcdbas_probe,
604 .remove = __devexit_p(dcdbas_remove),
605};
606
607/**
608 * dcdbas_init: initialize driver
609 */
610static int __init dcdbas_init(void)
611{
612 int error;
613
614 error = platform_driver_register(&dcdbas_driver);
615 if (error)
616 return error;
617
618 dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1);
619 if (!dcdbas_pdev) {
620 error = -ENOMEM;
621 goto err_unregister_driver;
622 }
623
624 error = platform_device_add(dcdbas_pdev);
625 if (error)
626 goto err_free_device;
627
628 return 0;
629
630 err_free_device:
631 platform_device_put(dcdbas_pdev);
632 err_unregister_driver:
633 platform_driver_unregister(&dcdbas_driver);
634 return error;
635}
636
Doug Warzecha90563ec2005-09-06 15:17:15 -0700637/**
638 * dcdbas_exit: perform driver cleanup
639 */
640static void __exit dcdbas_exit(void)
641{
Doug Warzecha435a80f2006-03-09 17:33:35 -0800642 /*
643 * make sure functions that use dcdbas_pdev are called
644 * before platform_device_unregister
645 */
Doug Warzecha90563ec2005-09-06 15:17:15 -0700646 unregister_reboot_notifier(&dcdbas_reboot_nb);
647 smi_data_buf_free();
Doug Warzecha435a80f2006-03-09 17:33:35 -0800648 platform_device_unregister(dcdbas_pdev);
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800649 platform_driver_unregister(&dcdbas_driver);
650
651 /*
652 * We have to free the buffer here instead of dcdbas_remove
653 * because only in module exit function we can be sure that
654 * all sysfs attributes belonging to this module have been
655 * released.
656 */
657 smi_data_buf_free();
Doug Warzecha90563ec2005-09-06 15:17:15 -0700658}
659
660module_init(dcdbas_init);
661module_exit(dcdbas_exit);
662
663MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
664MODULE_VERSION(DRIVER_VERSION);
665MODULE_AUTHOR("Dell Inc.");
666MODULE_LICENSE("GPL");
667